AASHTO Load Rating of Steel Girder Bridge With Collision
AASHTO Load Rating of Steel Girder Bridge With Collision
(OP)
Does anyone know if there is a reduction in capacity for a steel girder bridge that has had the bottom flange heat straightened after a traffic collision?






RE: AASHTO Load Rating of Steel Girder Bridge With Collision
Second Peter Xanthakos treats this subject matter in his text on bridge strengthening and rehabilitation. It is old and it certainly is not all encompassing but will offer some insight.
Also I recall that Verma teamed with LSU professor for research into Heat Straightening.
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Regards,
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RE: AASHTO Load Rating of Steel Girder Bridge With Collision
I've dealt with three fire damage bridges. Each time we proposed heat straightening. In one case the owner agreed. In the other two cases they owners wanted the safe route. one bridge was a century old single span riveted plate girder bridge the owner decided to replace the superstructure. It was a matter of practicality rather than money because the bridge is over Amtrak with catenary lines.
The other project was a three span continuous superstructure. We did a partial superstructure replacement of the damaged stringers. The person we were dealing with at DOT had no confidence in heat straightening, for good or bad he was a metallurgist.
Qshake - The professor you're thinking of is Richard Avent. He consulted on two of our projects.
RE: AASHTO Load Rating of Steel Girder Bridge With Collision
RE: AASHTO Load Rating of Steel Girder Bridge With Collision
RE: AASHTO Load Rating of Steel Girder Bridge With Collision
What's above the fascia - a sidewalk? traffic lane? I've seen much worse. If it's a sidewalk above, you probably don't need to do anything. If traffic is directly above, you may want to consider grinding smooth any deep nicks or cuts.
RE: AASHTO Load Rating of Steel Girder Bridge With Collision
This is a rolled section that is reinforced with top and bottom plates at the longest span. This was the original detail back in the day when labor was cheap and materials were expensive.
The bridge is a 3 lane highway with shoulders. Our project is a re-deck and will include repainting the girders. Part of our contract includes re-rating the bridge with the new deck.
Perhaps I can request the current rating calculations from the DOT to see how and why the rating is so much lower on the collision bridge.
RE: AASHTO Load Rating of Steel Girder Bridge With Collision
You should ask for the rating. At the least, I imagine they would want you to bring the bridge up to HS-20 or 25. Sometimes, one small area of section loss could be the cause of the low rating.
RE: AASHTO Load Rating of Steel Girder Bridge With Collision
larsacious - I agree with bridgebuster in his comments and recommendations. He's often right on the mark!
Also, I've see much worse collision damage repaired using heat straightening.
Good luck.
Regards,
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RE: AASHTO Load Rating of Steel Girder Bridge With Collision